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Note 7 - Investment Securities (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

		*March 31, 2025*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	541,663			$	10			$	29			$	541,644
U.S. government agency entities			8,787				50				114				8,723
Mortgage-backed securities			775,132				337				95,794				679,675
Collateralized mortgage obligations			26,949				—				2,286				24,663
Corporate debt securities			183,365				160				4,190				179,335
Total		$	1,535,896			$	557			$	102,413			$	1,434,040

		*December 31, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	621,212			$	250			$	—			$	621,462
U.S. government agency entities			9,226				50				127				9,149
Mortgage-backed securities			797,145				67				113,196				684,016
Collateralized mortgage obligations			27,747				—				3,191				24,556
Corporate debt securities			213,331				145				5,531				207,945
Total		$	1,668,661			$	512			$	122,045			$	1,547,128

Investments Classified by Contractual Maturity Date [Table Text Block]

		*March 31, 2025*
		*Securities AFS*
		*Amortized Cost*				*Fair Value*
		(In thousands)

Due in one year or less		$	581,976			$	581,554
Due after one year through five years			157,871				153,934
Due after five years through ten years			94,698				90,171
Due after ten years			701,351				608,381
Total		$	1,535,896			$	1,434,040

Unrealized Gain (Loss) on Investments [Table Text Block]

		*March 31, 2025*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		(In thousands)

Securities AFS
U.S. treasury securities		$	394,431			$	29			$	—			$	—			$	394,431			$	29
U.S. government agency entities			3,587				5				3,071				109				6,658				114
Mortgage-backed securities			14,888				340				648,958				95,454				663,846				95,794
Collateralized mortgage obligations			—				—				24,663				2,286				24,663				2,286
Corporate debt securities			9,985				15				118,990				4,175				128,975				4,190
Total		$	422,891			$	389			$	795,682			$	102,024			$	1,218,573			$	102,413

		*December 31, 2024*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		(In thousands)

Securities AFS
U.S. government agency entities		$	4,199			$	8			$	2,108			$	119			$	6,307			$	127
Mortgage-backed securities			29,955				959				653,236				112,237				683,191				113,196
Collateralized mortgage obligations			—				—				24,556				3,191				24,556				3,191
Corporate debt securities			24,900				100				127,744				5,431				152,644				5,531
Total		$	59,054			$	1,067			$	807,644			$	120,978			$	866,698			$	122,045